William b



(No Model.)

W. B. RISDON SAW TOOTH. I No. 337,083, I Patented Mar. 2, 1886.

5 Q v T b WITNESSES 5 INVENTOR i (j '1 Jib/(v .fl A 1 m 0g sawplnte illustrating my improvement. Fig.

I UNITED WILLIAM B. sisoos, or TRENTON,

,' AMERICAN sew COMPANY, or new YORK,

PATENT Orrics,

NEW'JERSEY, ASSIGNOR are THE- smegma forming part of Letters Bate nt No. s me. lama March 2, mac. 'Appllcatloxi filed October 9, 1885. Serial No. 179,439. (No model.)

To all whont it may concern:

Be it known that I, WILLIAM B. Rrsoon, of Trenton, in the county of Mercer and State of New Jersey, have invented a new and useful Improvementin Inscrtible Saw-Teetb,of which the following is a full, clear, and exact description.

Reference is to be had to the accompanying drawings, forming port of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure l is a side elevation of as partof a 2 is an edge view of the some. Fig.3 is a side elevation of a. bit-holding spring. Fig. 4 is :1. side elevation of a bit. Fig. 5 is a front elevation of the some.

The object cfthis-inventien is to provide insertible saw-teeth constructed in such a manner that theycan be readily inserted and removed without detaching the saw from its mandrel, and without removing the holdingspring from its seat.

The invent-ion consists in the peculiar construction and combination of parts, as will be l1ereinafter fully described and then claimed.

A represents the saw-plate, in the face of which are formed recesses B to receive the bitholding springs C and the nits D. The forward end of the recess B is made straight, is inclined to the rearward from a radial line, and is beveled, as shown in Figs. 1 and i In the plate A, at the rear end of the base of the recess B, is formed a projection, E, against which rests a toe, F, formed upon the rear end of the nose of the spring i).

In the spring G, between the toe F and the body of the snid spring, is formed a slot, G, to give greater elasticity to the said spring.

The saw-plate A at the base of the recess B has a V-slisped edge, to fitinto the cf-shaped roove in the base of the spring (3 to hold the said spring from lateral movementin its sent. The rear part of the recess B is curved in the arc of a circle, and in the plate A, at the rear side of the projection 15, is formed a recess, H, to receive a projection, 1, formed upon the inner part of the rear edge of the bit l).

In the convex rear edge of the bit 'D is formed a V-shaped groove to receive the V- shaped edge of the plste A at the rear partof the recess B, and in the concave forward edge of the said bit D is formed a rounded groove b0 receive the rounded edge of the rear part of the springO.

In the spring 0, opposite the rear corner of the projectionE, is formed a recess, J, and in the forward corner of the inner end of the bit 1) is formed a corresponding recess, K, the two recesses J K forming an aperture to receive a. tool for starting the bit D from its seat. After the bit D has been started from its seat the tool is iusertedb'etween the inner end'of the said hit and the rear side of the projection E and the removal of the bit is completed. The bit D is driven into the seat with a hamner, a socket-block being placed upon the edge of the said bit to protect the said edge from being injured by the blows of the hammer. Thespr-ing Oi's' inserted by'piecing the toe F against the forward side of the projection E and forcing the beveled forward end of the said spring into place against the beveled shoulder of the plate A at the forward end of the recess B by blows with a hammer against the side of the said forward The spring 0 isrespring down into its sent.

against the moved by blows with a hammer other side of its forward end.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- The combi nation, with the sowplate formed with a. recess, i), the rear end of which is straight and inclined rearward at one edge, nnd'the bottom of which is made A shape, curved and provided with the projection E between its ends, having a recess, ii, in its rear side, of the spring'fl, having its lower edge and rear end formed to engage the lower edge and the rem end of the recess ll, and formed with the rcurward-extending slot G, the recess 1, and n A- Shaped forward end, the bit I), having its sides grooved to engage the A- shapcd edges of ihe spring and recess, the projection I on its lower end'litting into the recess H, and the recess K, forming, in connection with the recess J, a tool-receiving aperture, sub itantiully as set forth.

' WlLLl'ANI B. RISDON.

Witnesses:

JAMES '1. GRAHAM, l EDGAR TATE.

end, the inclination of the said beveled edges forcing thee-aid 

